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On the non-attractive character of gravity in f(R) theories
F. D. Albareti, J. A. R. Cembranos, A. de la Cruz-Dombriz +1
In General Relativity without a cosmological constant a non-positive contribution from the space-time geometry to Raychaudhuri equation is found provided that particular energy con…
Black holes, cosmological solutions, future singularities, and their thermodynamical properties in modified gravity theories
A. de la Cruz-Dombriz, D. Saez-Gomez
Along this review, we focus on the study of several properties of modified gravity theories, in particular on black-hole solutions and its comparison with those solutions in Genera…
CMB Tensor Anisotropies in Metric f(R) Gravity
Hassan Bourhrous, Álvaro de la Cruz-Dombriz, Peter Dunsby
We present a description of CMB anisotropies generated by tensor perturbations in f(R) theories of gravity. The temperature power spectrum in the special case of is comp…
Indirect constraints to branon dark matter
J. A. R. Cembranos, A. de la Cruz-Dombriz, V. Gammaldi +1
If the present dark matter in the Universe annihilates into Standard Model particles, it must contribute to the gamma ray fluxes detected on the Earth. Here we briefly review the p…
Modified spinning black holes
J. A. R. Cembranos, A. de la Cruz-Dombriz, P. Jimeno Romero
In the context of f(R) modified gravity theories we determine that the black holes existence is determined by the sign of a parameter dependent of the mass, the charge, the spin an…
Gravitational collapse in f(R) theories
J. A. R. Cembranos, A. de la Cruz-Dombriz, B. Montes Nuñez
We study the gravitational collapse in modified gravitational theories. In particular, we analyze a general model with uniformly collapsing cloud of self-gravitating dust pa…